Sukenda,., Rusli,., NuryatiS., and HidayatullahD. “The Protective Duration of Streptococcus Agalactiae Vaccine in Nile Tilapia for the Prevention of Streptococcosis”. Jurnal Akuakultur Indonesia, Vol. 14, no. 2, Feb. 2016, pp. 192-01, doi:10.19027/jai.14.192-201.